/*!	 trgt_cairo_png.cpp
**	 png_cairo_trgt Target Png Cairo Module
**
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	Copyright (c) 2007 Chris Moore
**	Copyright (c) 2012-2013 Carlos López
**
**	This package is free software; you can redistribute it and/or
**	modify it under the terms of the GNU General Public License as
**	published by the Free Software Foundation; either version 2 of
**	the License, or (at your option) any later version.
**
**	This package is distributed in the hope that it will be useful,
**	but WITHOUT ANY WARRANTY; without even the implied warranty of
**	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
**	General Public License for more details.
**
** === N O T E S ===========================================================
**
** ========================================================================= */

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include <synfig/localization.h>
#include <synfig/general.h>

#include "trgt_cairo_png.h"
#include <ETL/stringf>
#include <cstdio>
#include <algorithm>
#include <functional>
#include <ETL/misc>

#endif

using namespace synfig;
using namespace std;
using namespace etl;

SYNFIG_TARGET_INIT(cairo_png_trgt);
SYNFIG_TARGET_SET_NAME(cairo_png_trgt, "cairo_png");
SYNFIG_TARGET_SET_EXT(cairo_png_trgt, "png");
SYNFIG_TARGET_SET_VERSION(cairo_png_trgt, "0.2");
SYNFIG_TARGET_SET_CVS_ID(cairo_png_trgt, "$Id$");

cairo_png_trgt::cairo_png_trgt(const char *Filename, const synfig::TargetParam &params):
    multi_image(false),
    imagecount(0),
    filename(Filename),
    base_filename(Filename),
    sequence_separator(params.sequence_separator)
{ }

cairo_png_trgt::~cairo_png_trgt()
{ }

bool
cairo_png_trgt::set_rend_desc(RendDesc *given_desc)
{
    desc = *given_desc;
    imagecount = desc.get_frame_start();

    if (desc.get_frame_end() - desc.get_frame_start() > 0) {
        multi_image = true;
    } else {
        multi_image = false;
    }

    return true;
}

bool
cairo_png_trgt::obtain_surface(cairo_surface_t *&surface)
{
    if (filename == "-") {
        synfig::error("Cairo PNG surface does not support writing to stdout");
    } else if (multi_image) {
        filename = (filename_sans_extension(base_filename) +
                    sequence_separator +
                    etl::strprintf("%04d", imagecount) +
                    filename_extension(base_filename));
    } else {
        filename = base_filename;
    }

    int w = desc.get_w(), h = desc.get_h();
    surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, w, h);
    return true;
}

bool
cairo_png_trgt::put_surface(cairo_surface_t *surface, synfig::ProgressCallback *cb)
{
    gamma_filter(surface, gamma());

    if (cairo_surface_status(surface)) {
        if (cb) {
            cb->error(_("Cairo Surface bad status"));
        }

        return false;
    }

    cairo_status_t status;

    if (get_alpha_mode() == TARGET_ALPHA_MODE_EXTRACT) {
        cairo_t *cr = cairo_create(surface);
        cairo_push_group_with_content(cr, CAIRO_CONTENT_COLOR_ALPHA);
        cairo_set_source_rgb(cr, 0, 0, 0);
        cairo_paint(cr);
        cairo_set_source_rgb(cr, 1, 1, 1);
        cairo_mask_surface(cr, cairo_get_target(cr), 0, 0);

        status = cairo_surface_write_to_png(cairo_get_group_target(cr), filename.c_str());

        cairo_destroy(cr);
    } else {
        status = cairo_surface_write_to_png(surface, filename.c_str());
    }

    if (status != CAIRO_STATUS_SUCCESS) {
        synfig::warning(cairo_status_to_string(status));
    }

    imagecount++;

    cairo_surface_destroy(surface);
    return true;
}